.pop{position: relative;}
div img{width: 200px;height: 200px;}
.div11{position: absolute;width: 200px;height: 200px;animation: myfirst 5s;
    -moz-animation: myfirst 3s;  /* Firefox */
    -webkit-animation: myfirst 3s;  /* Safari 和 Chrome */
    -o-animation: myfirst 3s;top: 0;background:#fff;left:0;}
@keyframes myfirst
{
    0%   {left: 0;}

    100% {left:200px;}
}

@-moz-keyframes myfirst /* Firefox */
{
    0%   {left: 0;}

    100% {left:200px;}
}

@-webkit-keyframes myfirst /* Safari 和 Chrome */
{
    0%   {left: 0;}

    100% {left:200px;}
}

@-o-keyframes myfirst /* Opera */
{
    0%   {left: 0;}

    100% {left:200px;}
}